Charles p



(Model.)

C. P. GROUT.

- Dental Enggilfle.v No. 236,326. v vPatented* Jan. 4,1881.

Unirse STATES PATENT Oria-CE..

CHARLES P. GROUT, OF NEV YORK, N. Y.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 236,326, dated January4, 1881.

Application filed June 24, 1880. (Model.)

To all whom it may concern Beit known that I, CHARLES P. Gaoufr, of thecity of New York, in the county and State ot' New York, have inventedcertain new and useful Improvements in that class of machines fortransmitting motion commonly known as Dental Engines,77 of which thefollowing is a specification.

One of my improvements consists in the combination, in a dental engineormachine, for transmitting motion, of a base, a standard, adriving-Wheel supported in said standard, and a universal joint forminga connection between the said base and standard, and preferably, also, aclamping device for securing said standard in different positions.

Another of my improvements consists in the combination, in a dentalengine, of a standard, a drivin g-wheel supported in said standard, andhaving a crank attached thereto, a treadle adapted to be adjusted aroundsaid standard at different angles thereto, and a rod forming a directconnection between said treadle and crank.

Another of my improvements consists in the combination, in a machine fortransmitting motion, of a base comprising an arc-shaped treadle-support,a treadle tted upon said support, a driving-wheel and crank, and a rodforming a direct connection between the treadle and crank, the wholearranged so as to permit the horizontal adjustment ofthe treadle alongsaid guide.

Three of my improvements relate to those machines in which the upperportion of the standard is hinged or pivoted relatively to the lowerportion and a spring is employed for bringing the standard automaticallyback to a vertical position when desired.

One of such improvements consists in the combination, with such astandard, of a stationary clamping plate, a spring actuated plate orpiece, and a clamping-screw carried by the standard, whereby facility isafforded for holding the upper part of the standard at an angle to thelower part thereof by friction, or by securely clamping it in position.

Another of such improvements consists in a novel means whereby theLipper or hinged portion of the standard may be locked to or releasedfrom the spring which tends to bring it to a vertical position.

The third of such improvements consists in a novel means for adjustingthe power of the above-mentioned spring.

Other improvements consist in the combination of two shafts, two hingedframes comprising bearings for said shafts, pulleys upon said shafts forthe reception of a band, and guide-pulleys, over which said band isdeiiected as the frames are turned relatively to each other to bring theshafts toward a position in line with each other; also, -in a novelarrangement and construction of hood attaohed to said frames forconcealing the pulleys and band.

Other of my improvements consist in various combinations of parts anddetails of construction embodied in the upper part of the machine,wherebyr a greater range of adjustment is secured, and which are to behereinafter fully described.

1n the accompanying drawings, Figure 1 represents a side view, partly insection, of a machine embodying my invention. Fig. 2 represents a sideview thereof, at right angles to Fig. 1, and also partly in section.Fig. 3 represents a horizontal section through the standard ofthemachine, at about the center of the ,driving-wheel bearin g. Fi guetrepresents a detail view of the treadle, connecting-rod, and crank. Fig.5 represents a detail view, hereinafter to be explained. Fig. 6represents a side view of the two hinged frames, with a hood of modifiedform attached thereto 5 and Figs. 7 and 8 represent detail views, uponan enlarged scale, of a. modified arrangement of guide-pulley for use inconnection with said frames.

Similar letters of reference designate corresponding parts in all thefigures.

A designates the base of the machine, to which is secured the standard,consisting of a lower portion, B, and an upper portion, Bl.

O designates the driving oriiy wheel, mounted in bearings in the part Bof the standard, and in the present example of my invention the shaft ofsaid fly or driving wheel forms the and connecting them together.

pivot which supports the upper portion, B', l

of the standard, and upon which the latter may turn.

As clearly shown in Figs. l and 2, the standard is connected to the baseby a universal or ball-and-socket joint, D, which may be tightened by alever, a, so as to hold the standard at an angle relatively to the base.Though a ball-and-socket joint is preferable, a simple knncklejointmight be used.

To the shaft of the driving-wheel C is attached a crank, C', which isactuated by a treadle, C2, through a connecting-rod, C3. To adapt thetreadle and rod for operating the crank when the standard is swung outof a vertical position, I attach the said connectingrod to the crank bya ball-aiid-socket-joint, b, and to the treadle by inserting said rod ina socket, c, attached to the treadle, wherein it may be secured by aset-screw, d. The connectingrod C3 is composed of two pieces connectedby a piece, C4, which comprises two sockets for the reception of ballsupon the ends of the pieces forming the connecting-rod The piece G4 ispivoted at e to the lower part of the standard, so as to serve as aradius-link.

In order to enable the operator to adjust the treadle into convenientposition for use, I attach to the base A an arc-shaped treadle-support,A', upon which the treadle maybe shifted horizontally at dit'erentangles relatively to the standard, the connecting-rod C3 forming adirect connection between the crank and treadle in whatever position thelatter may be adjusted to. In the present instance afoot or block,f, isarranged to slide upon said support, and the treadle is hinged to saidblock or foot.

E designates a spring employed to bring the upper portion, B', ofthestandard back to a vertical position after it has been deflected ineither direction.

In order to hold the upper portion of the standard in any desiredposition, and prevent its return by the spring E, I employ a stationaryarc-shaped or segmental plate, F, and provide the said portion B' of thestandard with a clamping-screw, g, which may be turned to lock the upperportion, B', of the standard at any position relatively to the lowerportion thereof.

In lieu of employing the screw g to clamp the portion B' ot' thestandard at an angle to the lower portion, I may employ a plate orpiece, g', adapted to be pressed against the clamping-plate F by thepressure of a spring, g2, and thus effect the same result by thefriction of the piece g' against the claml'iing-plate F, as shown inFig. 2.

In order to adjust the spring E to the exact tension required, I employa sheath, E', adapted to be adjusted up and down upon said spring, andforming an auxiliary spring of much greater strength than the spring E.When the sheath or auxiliary spring is moved upward the power or tensionof the spring is increased, but when moved downward the tensionthereot'is diminished.

In some cases it may be desired to dispense with the spring-power forraising the upper part ot' the standard-as, for instance, when it isdesired to use the machine for a long time with the part of the standardinclined, I coilnect the spring E to a socket or sleeve, G, tit tingupon the upper portion, B', of the standard and adapted to slide up anddown thereon. Vhen it is desired to disconnect the spring, the saidsleeve or socket is raised into the position shown in dotted outline illFig. 2.

Supported upon the upper end of the portion B' ot the standard is aframe, H, fitting upon the standard, and secured in place by aset-screw, h. The frame II comprises a socket, H', to the interior otwhich a sleeve, t', is fitted, and is provided with a set-screw,j, forholding the sleeve in any position after it has been verticallyadjusted.

I designates a frame or yoke comprising bearings for a cone-pulley, I',and having a shank or stem, k, fitting in the sleeve The. frame or yokeI is composed ot' two pieces adapted to swing independently oteach otherupon the shaft of the cone-pulley I' as a pivot.

I2 designates guide-pulleys, supported upon a shank or stem, l, whichtits the interior ot' the standard B', and is adapted to be secured inany vertical position bythe screw l1., which holds the frame H in place.

It is obvious that when it is desired to pass the band J over anyparticular step ot' the cone-pulley I the sleeve v must be raised orlowered in the socket Il', so as to bring the step of said pulleyopposite the upper periphery ofthe guide-pulleys l2.

To the yoke or frame I is hinged a second yoke or frame, K, whichfurnishes a hearing for the shaft K', to which motion is imparted from apulley, m, upon the shaft of the conepulley I', by a band, u, passingaround guidepulleys n' and over a pulley, a2, upon the end of the shaftK'. This affords provision for turning the shaft K into a positioninline with the cone-pulley I', or into a position parallel therewith,or at any angle between said two extreme positions. When the shaft K isturned up into line with the pulley I a greater length of band i1, isrequired than when it is turned down into a nearly-parallel position,and to prevent undue straining of the band the guide-pulleys it aresupported upon studs projecting from the pin or pivot 0, (sec Fig. 2,)which hinges the i'ranie or yoke K to the frame or yoke I', the saidstuds heilig eccentric to the center ofthe pin o. lVhen so constructedthe lower side ot' the periphery of the guide-pulleys a' is nearlycoincident with the center of pin 0, and in turning the frame K overparallel with the frame I the belt or band n is not strained. This sameresult may be accomplished by mounting the pulleys n' 011 studs a3,separate from the hinge-pin o, as

IOO

IIO

vss

shown in Figs. 7 and 8, and in such case the studs n3 are arranged toslide in bearings n4, and springs a5 are employed to press them outwardfrom the centers of the shaft K' and of the cone-pulley I' when the twoare inline with.

each other. As the band n is drawn over the pulleys n by the swing ofthe frameA K, the pulleys n' are moved inward against the pressure ot'the springs a5, and the straining of the band obviated.

In order to partly support the shaft K' and connections, when turnedoutward to an approximately horizontal position, as shown in Fig. 1, Iemploy a spring, p, coiled around the pin o, uniting the frames I and K,as represented in Figs. l and 5.

L L' designate two frames like the frames I and K, hinged together inthe same way. The fratne L is loosely fitted upon the shaft K', and theframe L' supports the shaft M, which is intended to carry a tool.

Motion is imparted from a pulley, q, on the shaft K' by a band, r,passing around guidepulleys s and over a pulley, t, upon the shaft M,the guide-pulleys being similar to the pullcys u', and supported in thesame way. The shafts K' and M are free to turn in their bearings in theframes supporting them, and are furnished with collars u, for preventingtheir shifting lengthwise.

In order to prevent the hair or whiskers of an operator from catching inthe belts or bands n and r, I employ guards or hoods O, attached to eachof the frames I K L L', and serving to conceal the pulleys over whichthe bands'u and r pass, as clearly shown in Fig. 5.

In lieu of the form of hood shown in Figs. 1, 2, and 5, I may employ ahood composed of sections O', as shown in Fig. 6, the two end sectionsheilig permanently attached to the frames I and K, and the severalsections being so constructed that they telescope one within anotherwhen the frames are swung together from the position shown in Fig. 6.The several sections may be connected at their lapping` edges by pins,and working in slots, so that the separation at the edges is prevented.

By my invention I provide a dental engine in which varied adjustments ofthe several parts are readily effected, and a very wide range ofadjustment secured, which are the great aims in constructing such amachine.

Although my improvements are here shown as embodied in a dental engine,I do not intend to limit them to machines for dental use only; but theymay be embodied in similar machines for other purposes.

I am aware that I am not the irst inventor of a dental engine comprisinga tilting upright and means for securingitin a normallyinclinedposition, and I do not, therefore, claim this as my invention. y

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination, in a dental engine, of

a base, a standard, a driving-wheel supported in said standard, and auniversaljoint forming a connection between said base and standard topermit the tilting of the latter from a vertical position in anydirection, substantially as specitied.

2. The combinatiomin a dental engine, ot a' base, a standard, adriving-wheel supported in said standard, a universal joint forming aconnection between said base and standard to permit the tilting of thelatter from a vertical position in any direction, and a device forrigidly securing said standard in diierent positions to which it may beadj Listed, substan.

tially as specitied.

3. The combination, in a dental engine, of a base, a standard, adriving-wheel and crank supported in said standard, a treadle, aballand-socket or universal joint between the base and standard, and arod with a ball-and-socket or universal connect-ion between said treadleand crank, substantially as specified.

4. The combination, in a dental engine, ot' a standard, a driving-wheelsupported in said standard and having a crank attached thereto, atreadle adapted to be adjusted around said standard at different anglesthereto, and

a rod forming a direct connection between said crank and said treadle,substantially as specitied.

5. 'Ihe combination, in a dental engine, of a driving-wheel, a crankattached thereto, a base comprising an arc-shaped treadle-support, atreadle adapted to be adjusted horizontally upon said support, and a rodforming a direct connection between said treadle and said crank,substantially as specified.

6. The combination of the base A, the arcshaped treadle-support A', thestandard B B', the ball-and-socket joint D, the driving-wheel C, thecrank C', the treadle C2, rod C3, and radius-link e, all substantiallyas specified.

7. The combination of the standard B B', the stationary clamping -plateF, the clamping-screw g, the plate g', and spring g2, substantially asspecitied.

8. The combination, in a dental engine, of a standard composed of alower and an upper portion hinged together, a spring attached to oneportion and engaging with another IOO IIS

for holding the two portions in line one with the other, and a sheathlongitudinally adjustable on said spring for increasingor diminishingits tension, substantially` as specified.

9. The combination, in a dental engine, of a standard composed of alower and an upper portion hinged together, a spring attached to thelower portion, and a socket adapted to slide longitudinally upon theupper portion, and engaging with said spring, whereby a convenient meansis ait'orded for disconnecting the spring from theupper portion,substantially as specitied.

10. The combination, in a dental engine, ot' a driving-wheel, avertically-arranged conepulley, guide-rollers for deecting a band fromthe driving-wheel to the cone-pulley, and a i'rame or yoke supportingthe eene-pulley and adapted to be vertically adjusted for bringilrgr anystep of said pulley opposite the guide pulleys, substantially asspecified.

11. The combination ofthe tubular socket H', the vertically-adjustablysleeve 17, the frame I, provided with the stem 7:, fitting' in saidsleeve, and the cone-pulley supported in the frame I, substantially asspecified.

l2. The combination of the frames I K, hinged together, and the springp, arranged substantially as specified.

13. 'lhe hinged frames I K, and the hood composed of sections O', thetwo end sections being,` permanently attached to the said frames,

and the others adapted to telescope or slide one Within the other,substantially as specified.

14. The combination of two shafts, frames I K, hinged together andcomprising bearings for said shafts, pulleys m n2, a band, n, passingaround said pulleys, and guide-pulleys u for said band, substantially asspecified.

15. The combination of the frames I K, hinged together by the pin o, thepulleys m n2, and the guide-pulleys u', supported upon movable studs u,and springs a5 for bearing upon said studs, substantially as specified.

CHAS. I. GROUT.

Witnesses:

FREDK. HAYNES, A. C. WEBB.

